Pneumatic means for stripping laminated paper stock



A. L. SCOTT Nov. 2l, 1944.

PNEUMATIC MEANS FOR STRIPPING LAMINATED PAPER STOCK Filed Sept. 18, 1945 2 Sheets-Sheet 1 @www Nov. 2l, 1944.

A. l.. scoTT PNEUMATIC MEANS FOR STRIPPING LAMINATED PAPER STOCK Filed Sept. 18, 1943=y 2 Sheets-Sheet 2 y/M/f/f/ if N- iatented NovgZl, 1944 PNEUMATIC MEANS FOR STBIIPPING LAMINATED PAPER STGCK Arthur L. Scott, Columbus, Ohio, assignor to Frankenberg Bros., Inc., Columbus, Ohio, a.

corporation of Ohio u Application September 18,1943, Serial No. 502,937

3 Claims.

This invention relates to apparatus for manufacturing folding paper board boxes,\particularly paper board boxes of the type having an inner lining.

In the manufacture of such boxes, it is often desirable to remove from the paper board blank a strip or other body of the paper board material in order that the lining may project beyond the marginal edges of said regions of the body. This is particularly true in cases where the lining is employed to seal completely the contents enclosed within the folded box, as set forth in the application Ser. No. 502,939 of Clarence F. Klein, entitled Method of making paper board containers, executed of even date herewith.

Accordingly, it is an object of the present invention to provide simple, inexpensive and eilicient means whereby during the operation of folding and gluing a paper board box, a strip or other body may be removed from association with the lining of the box.

It is another object of the invention to provide an attachment for a box-folding and gluing machine so constructed that during passage of the box blanks through the machine, the strip or other region of the blank to be removed is brought into engagement with pneumatically actuated means to effect the removal of the part to be eliminated from the box blank, the operation taking place in an automatic manner and Without in any way affecting the speed of operation of the folding and gluing machine.

It is a further object of the invention to provide in association with said pneumatic stripremoving means a. heating mechanism by means of which an adhesive uniting the lining material with the strip or other body of the blank to be removed is adapted to be softened by the action of heat, so that when the strip is brought into engagement with said pneumatic means, the ready separation of the strip or body from the lining may be quickly and positively carried out.

For a further understanding of the invention, reference is to be had to the following description and the accompanying drawings, wherein:

Fig. 1 is a fragmentary perspective view showing the guideway of a box\folding and gluing machine, and illustrating the heating and stripremoving mechanism comprising the present invention;

Fig. 2 is a vertical transverse sectional view taken through the heater mechanism on the line taken through the pneumatically operating stripremoving mechanism; Y

' type. Such boxes, as shown in Fig. 2, are each secured by means of a heat-'softening adhesive a lining il. The lining usually comprises a thinmoisture resisting and fat-repelling substance, such as parchment, various synthetic films, Cellophane, wax paper or their equivalents. The union of the lining with the paperboard stock is effected preferably by applying to the stock, the lining, or both, a heat-softening adhesive, such as Wax, paraiiin, or a soft plastieized resin. I have used advantageously an adhesive which has a melting point of the order of to 165 Fahr. The adhesive is uniformly and ordinarily thinly distributed over the meeting surfaces of the paperboard stock and lining and, with the application of heat and pressure, the lining adheres firmly to the paperboard stock and becomes, in effect, a component part thereof.

Often it is desirable thatthe lining should project marginally beyond the blank, as indicated at I 2 in Fig. 2. This is done during the forming of the blank by cutting through the latter to the lining, as shown at I3, leaving a free strip I4 which temporarily is held in association with the blank by the adhesive uniting the strip with the marginal portion of the lining. It is the purpose of the present invention, as previously explained, to provide eflicient production means for removing the strip Il, or other equivalent body, from its association with the lining.

Such an operation may be carried out by means of mechanism forming an attachment upon a standard blank-folding and gluing machine, although, as the nature of the invention is better understood, it will be appreciated that the mechanismmaybeembodiedinaseparatemachinelf such a mechanism should for any reason be desirable.

In the drawings, the blank guideway of a folding and gluing machine is indicated at I5, the bottom of the guideway being provided with spaced bottom plates I8, between which is arranged the upper run of a blank-advancing belt I1, the latter being supported on the usual guide and operating rolls I3. Above the belt, the frame of the machine is provided with a bar I3 which effects the support of pivoted pressing rollers which engage the upper surfaces of the blanks moving through the guideway, causing the blanks engaged positively with the upper surfaces of the belt I1 to assure their rapid and positive movement through the guideway.

In accordance with the present invention, one of the side bars 2| of the guideway has its inner and vertical flange provided with an elongated stationary housing 22, in which is arranged a body of insulation 23 carrying a suitably energized heating resistor 24. 'I'he housing is of such length, in proportion to the speed of linear advance of the blanks through the guideway, that a sufficient period of time will be provided to enable the heat developed by the resistor to permeate through the lining and soften the adhesive uniting said lining with the stripl I4, whereby to permit the strip to be separated from the marginal portion I2 of the lining.

To effect such separation, I employ preferably pneumatically operated means. This means, in a preferred embodiment, comprises a stationary shaft 25 which is mounted so that it will be disposed transversely of the bed 26 of the gluing and folding machine. One end of the shaft is iournaled in a bracket bearing 21 stationarily carried by the bed or frame of the machine, while the opposite endof the shaft is machine pressed into one end of a sleeve 28, as shown in Fig. 3. This sleeve is internally threaded to receive the threads of a stationary stud shaft 29, projecting from the bed frame. Adjacent to the bearing 21, the shaft 25 carries a stationary bushing 30 which effects the rotatable support of one end of a revolving tubular shaft 3|, the opposite end of the latter being journaled on the sleeve 28 and provided with a belt wheel 32 by means of which power is imparted to the sleeve to effect its rotation about the axis of the stationary shaft 25.

Fixed to rotate with the shaft 3| is a circular ported head 33, the latter being provided 'with a multiplicity of eircumferentially spaced,

radially disposed ports 34. Each of these ports at one end opens to a side of the head 33 and at the other end to the outer peripheral surface of said head, said surface being disposed immediately beneath the removable strip I4 of the box blank. Cooperative with the head 33 is a stationary ported collar 35, this collar being mounted on a bushing 36 carried by the shaft 3|.

To prevent rotation of the collar in unison with the shaft 3|, the latter has fixed thereto a ring 31 with which engages a loose spring-seating quill 33. One end of a coiled expansion spring is engaged with the quill, while the opposite end of the spring presses on one of the side surfaces of the collar 35, thereby exerting a pressure on the collar by means of which the opposite face of the collar is positively held in close engagement with the ported face of the head 33. Further, the collar, as shown in Fig. 6, is provided with an outwardly projecting arm III 33, the outer end of said arm carrying an adengages with one of the members of the bed frame of the folding and gluing machine. By adjusting the screw 43, the collar may be axially adjusted with respect to the shaft 3|. The screw also serves to prevent rotation of the collar,

except in accordance with adjustment requirements furnished by said screw.

'Ihe interior of the collar is provided with a port 4|, which is connected by means of a pipe or hose line 42 to a vacuum pump, not shown. The end r' f the port 4| opposite to the pipe 42 communi,A tes with one side of the collar 35 and with the ports 34 of the head 33. The collar 35 is provided with an additional port 43, one end of which is disposed in communication with the ports of the head 33 and the other with the atmosphere.,

It will be seen that the head 33 has its outer peripheral wall arranged so that the ports thereof will be in registration with the removable strips I4 of the box blanks which pass through the guideway I5. Close registration is secured by the provision of a pressing roller 44.` This roller is carried by the outer ends of a pair of pivoted links 45, the inner ends of said links being pivoted to a yoke 46 carried by a transverse frame beam 41 of the folding and gluing machine. A coil spring 48 surrounds the pivot rod for the links 45, and has one end fastened as at 49, to the yoke 46, while the opposite end of said spring is engaged with a pin 50 which projects inwardly and laterally from one of the links 46. By this means, the roller 44 presses downwardly on the blanks maintaining thestrip portions I4 thereof in firm engagement with the ported peripheral surface of the head 33.

In the operation of the machine, successive box-forming blanks, having the cut strips I4, are fed rapidly through the guideway I5. While such blanks are in a flattened state, and before they reach the folding and gluing instrumentalities of the machine, the strip regions I4 thereof pass immediately under the housing 22 of the heater. During the passage oi' the blanks beneath the heater, the adhesive employed thereon in uniting the strips I4 with the linings I I, is softened so that when the adhesive is in this state, the strips may be readily parted from their associated linings. The rotary suction head 33 isvlocated in the gluing and folding machine at the point of termination of the heater housing, so that as the strips I4 pass over the head 33, the suction forces created in the ports of said head will cause the strips to adhere to the outer peripheral surface of the head, after the manner indicated in Fig. 4. The released lining continues to advance in the horizontal plane of the guideway I 5, while the removed strips are deflected downwardly away from the guideway. As the head 33 turns, the ports thereof are removed from engagement with the suction-inducing forces and by engagement with the port 43 of the collar, communicate with the atmosphere. This equalizes the air pressure on both sides of the removed strips, so that the latter may fall into a collecting rreceptacle, not shown, at the bottom of the folding and gluing machine. Strips or other bodies are thus removed at a rapid rate from laminated paperboard and the operation is carried out economically and without any sensible addition to the normal operations involved in making a standard paperboard carton.

I claim:

1. In apparatus for producing folding cartons of the type formed from a sheet of paperboard on which a sheet of lining material is secured by means of a heat-softening adhesive and wherein the paperboard sheet possesses a region severed from its body but retained in connection there-- with by said lining sheet, a guideway, means for eiecting linear advance of the blanks through said guideway, a heater in said guideway for locally heating said blanks as the same move therethrough, said heater serving to soften the adhesive uniting the severed region of each blank with its lining material, and means operativeI while said adhesive is in a softened state to remove the severed region of each blank from the lining material.

2. In apparatus for producing folding cartons of the type formed from a sheet of paperboard on which a sheet of lining material is secured by means of a heat-softening adhesive and wherein the paperboard sheet possesses a region severed from its body but retained in connection therewith by said lining sheet, a guideway, means for effecting linear advance of the blanks through said guideway, a heater in said guideway for locally heating said blanks as the same move therethrough, said heater serving to soften the adhesive uniting the severed region of each blank with its lining material, and means operative when said adhesive is in a softened state to establish unbalanced pressures on opposite sides of the severed region of each blank to remove the same from the lining material.

3. Inapparatus for producing paperboard boxes from blanks composed of a sheet of paperboard on which a sheet of lining material is applied and wherein the paperboard sheet but not thelining is severed along selected lines within the connes of each blank to provide removable bodies, a guideway, means for advancing said paperboard blanks linearly and in successive order through said guideway, a heater for locally heating the blanks to soften the adhesive uniting the severed bodies thereof with said lining sheets, and pneumatically actuated means operative' 'during the continued advance oi the blanks through said guideway to remove the severed bodies from said blanks and their associated lining sheets. p

ARTHUR L. SCOTT. 

